First of all, you have a very good eye for composition.

Image 1: Its hard to know exactly what the subject is. The trees are in focus and the bridge is not out of focus enough for it to genuinely blend into the background. When you have a very strong background element like the bridge, throw the aperture wide as it will go so that the background will be more out of focus. The same would be true if you are photographing the bridge and you want your foreground to be out of ficus. If your intent is to have both in sharp focus, then use a tripod and stop down. BTW, I know exactly where this bridge is--I have photographed it myself. It brought back some fond memories even though I ended up in the river hen I tried my hand.

Image 2: Nice composition but I would like to see more detail in the shadow areas.

Image 3: Another nice composition. As another poster said, the image needs to be leveled. Also, there is an element on the left edge of the frame (a fence maybe?) which I find a little distracting. I would either crop it out or "content-aware fill" it away.

I hope this helps.

The tree on the left is distracting to my eye. If I were facing this scene, I would make an attempt to catch the bridge with nothing between me and the lovely bridge, like walking down the hill and shooting more up, or walking in front of the trees that are showing, or even zooming in between the two trees. Framing an object sometimes works, but the trees become objects themselves instead of a light framing at both sides.

Thank you for your positive feedback.

Next two are pleasing compositions, but you might consider bringing more mid-tones out for better details, especially the bridge. I like how you have used leading lines in both of these images.